AcceptValidator: Add basic validator with tests.

test/web/activity_pub/object_validators/accept_validation_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.ObjectValidators.AcceptValidationTest do
+  use Pleroma.DataCase
+  alias Pleroma.Web.ActivityPub.Builder
+  alias Pleroma.Web.ActivityPub.Pipeline
+  alias Pleroma.Web.ActivityPub.ObjectValidator
+
+  import Pleroma.Factory
+
+  setup do
+    follower = insert(:user)
+    followed = insert(:user, local: false)
+
+    {:ok, follow_data, _} = Builder.follow(follower, followed)
+    {:ok, follow_activity, _} = Pipeline.common_pipeline(follow_data, local: true)
+
+    {:ok, accept_data, _} = Builder.accept(followed, follow_activity)
+
+    %{accept_data: accept_data, followed: followed}
+  end
+
+  test "it validates a basic 'accept'", %{accept_data: accept_data} do
+    assert {:ok, _, _} = ObjectValidator.validate(accept_data, [])
+  end
+
+  test "it fails when the actor doesn't exist", %{accept_data: accept_data} do
+    accept_data =
+      accept_data
+      |> Map.put("actor", "https://gensokyo.2hu/users/raymoo")
+
+    assert {:error, _} = ObjectValidator.validate(accept_data, [])
+  end
+
+  test "it fails when the accepted activity doesn't exist", %{accept_data: accept_data} do
+    accept_data =
+      accept_data
+      |> Map.put("object", "https://gensokyo.2hu/users/raymoo/follows/1")
+
+    assert {:error, _} = ObjectValidator.validate(accept_data, [])
+  end
+end